2026 Forest River Columbus / Puma Mesa379MBL

The Columbus 379MBL has 2,121 lbs of cargo capacity between 14,664 lbs dry and its 16,785 lbs GVWR, 13% of that rating; filling its 75-gallon fresh tank at 8.3 lb a gallon uses 622 lbs of it (how to read trailer weights).

Pin weight is 2,785 lbs, 19% of the dry weight as published; it rises as the trailer is loaded and comes off the truck’s payload, not its towing rating, so check it against the payload on your own door sticker (pin weight and payload).

Off hookups: 117 gallons of grey and black capacity against 75 gallons of fresh water, so fresh water runs out first (tank sizes by length).

Against the rest of the Columbus roster this is the 8th of 8 floorplans by dry weight, in a line that runs from 10,464 lbs to 14,664 lbs. It is the heaviest plan in the line, so the tow vehicle should be settled before the floorplan is.

Plan the tow on loaded weight, not the 14,664 lbs dry figure: half the published cargo capacity brings this plan to about 15,724 lbs, and the published GVWR of 16,785 lbs is the limit (how to read trailer weights).

Forest River’s line listing and this floorplan’s own factory page agree on all 4 shared figures. Dry weight plus cargo capacity equals the published GVWR exactly. A missing row means Forest River does not publish that figure (how figures are verified).

Forest River publishes no floorplan description for this plan in the channel this page is built from - only the numeric specification block. Rather than describe a layout from the floorplan code, which would be a guess dressed as a fact, this page carries what the factory publishes and says where it stops. 379MBL is a Columbus designation and this site does not decode it into a layout claim.

How the 379MBL differs from the other seven Columbus floorplans. Most distinctive first. Sibling pages may cover other model years than this one (2026). How these ranks are worked out.

• Dry weight, 14,664 lb: heaviest of eight; next is the 389FLH (14,529 lb).
• GVWR, 16,785 lb: highest of eight; next is the 384RKH (16,690 lb).
• Pin weight, 2,785 lb: heaviest of eight; next is the 384RKH (2,690 lb).
• Cargo capacity, 2,121 lb: second-smallest of eight, between the 389FLH (2,026 lb) and the 377DS (2,141 lb).
• Cargo capacity as a share of GVWR, 12.6%: second-smallest of eight, between the 389FLH (12.2%) and the 377DS (13%).
• Pin weight as a share of dry weight, 19%: third-largest of eight, between the 360FK (18.9%) and the 383RLH (19.4%).
• Grey tank, 78 gal: smallest of eight, level with the 340RG, 360FK and 383RLH; next are the 388FKH and 389FLH (110 gal).
• Black tank, 39 gal: smallest of eight, level with the 340RG, 360FK and 389FLH; next are the 383RLH and 384RKH (71 gal).
• Length, 42 ft 7 in: shared with the 377DS and 389FLH; of eight, three shorter and two longer, nearest the 383RLH (41 ft 5 in) and the 388FKH (42 ft 10 in).

Next to the 389FLH, the nearest lighter floorplan by dry weight, the 379MBL is 135 lb heavier by dry weight, has a GVWR 230 lb higher, has 95 lb more cargo capacity, has a pin weight 230 lb heavier and has a grey tank 32 gal smaller; the two publish the same length, exterior height, fresh tank and black tank.

Columbus is a tight roster of six large fifth wheels and the numbers barely move across it: 13,609 to 14,664 lb dry over lengths of 41 feet 5 inches to 43 feet. What does move is cargo capacity, 2,026 to 3,026 lb - a thousand-pound spread on trailers within a thousand pounds of each other dry, so the useful comparison inside this line is payload rather than size. Pin weight runs 2,480 to 2,785 lb, and every plan ties out exactly against its published GVWR.

A full 75-gallon fresh tank is about 622 lb of water (water counts as cargo: 49 CFR 571.120 S10.4.2), 29% of the 379MBL’s 2,121 lb cargo capacity, leaving 1,498 lb. Across 8 Columbus floorplans the water share runs 21% to 31%, and 1 gives up more than this one. Nearest on that share: Columbus 377DS at 29% and Columbus 389FLH at 31%. Your own unit’s figure is on the label inside its entry door (49 CFR 571.120 S10.4.3).